package edu.gdin.ecommerce.security.support;

import java.util.Collection;
import java.util.Iterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

 
public class MyAccessDecisionManager implements AccessDecisionManager {
	
	/** 日志处理器 */
	protected Log logger = LogFactory.getLog(getClass());
	
    // In this method, need to compare authentication with configAttributes.
    // 1, A object is a URL, a filter was find permission configuration by this URL, and pass to here.
    // 2, Check authentication has attribute in permission configuration (configAttributes)
    // 3, If not match corresponding authentication, throw a AccessDeniedException.
    public void decide(Authentication authentication, Object object,
            Collection<ConfigAttribute> configAttributes)
            throws AccessDeniedException, InsufficientAuthenticationException {
    	if(logger.isDebugEnabled()){
			logger.debug("configAttributes:"+ configAttributes);
		}   
        if(configAttributes == null){
        	 return;
        }
        
        Iterator<ConfigAttribute> ite=configAttributes.iterator();
        while(ite.hasNext()){
            ConfigAttribute ca=ite.next();
            String needRole=((SecurityConfig)ca).getAttribute();
            System.out.println("needRole:" + needRole);
            System.out.println("Authorities:" + authentication.getAuthorities());
            for(GrantedAuthority ga : authentication.getAuthorities()){
            	//System.out.println(ga.getAuthority() + "-----------");
                if(needRole.equals(ga.getAuthority())){  //ga is user's role.
                    return;
                }
            }
        }
        
        throw new AccessDeniedException("no right");
    }

    public boolean supports(ConfigAttribute attribute) {
        // TODO Auto-generated method stub
        return true;
    }

    public boolean supports(Class<?> clazz) {
        return true;
    }


}
